4 files changed, 86 insertions, 4 deletions
diff --git a/src/battlemap.erl b/src/battlemap.erl
new file mode 100644
index 0000000..209a4ab
--- /dev/null
+++ b/src/battlemap.erl
@@ -0,0 +1,24 @@
+-module(battlemap).
+-export
+(
+   [
+      cross/4
+   ]
+).
+
+-include("timed_cache_data.hrl").
+
+calc_new_loc (X, Y, [], _Points, _Map, _OtherChars) ->
+   {X, Y};
+calc_new_loc (X, Y, [Step|Path], Points, Map, OtherChars) ->
+   case Step of
+      <<"U">> -> calc_new_loc(X, (Y - 1), Path, Points, Map, OtherChars);
+      <<"D">> -> calc_new_loc(X, (Y + 1), Path, Points, Map, OtherChars);
+      <<"L">> -> calc_new_loc((X - 1), Y, Path, Points, Map, OtherChars);
+      <<"R">> -> calc_new_loc((X + 1), Y, Path, Points, Map, OtherChars);
+      _ -> calc_new_loc(X, Y, Path, Points, Map, OtherChars)
+   end.
+
+cross (Battlemap, CharInst, Path, OtherChars) ->
+   {X, Y} = character_instance:get_location(CharInst),
+   {ok, calc_new_loc(X, Y, Path, 99, Battlemap, OtherChars)}.
diff --git a/src/battlemap_instance.erl b/src/battlemap_instance.erl
new file mode 100644
index 0000000..ef573eb
--- /dev/null
+++ b/src/battlemap_instance.erl
@@ -0,0 +1,33 @@
+-module(battlemap_instance).
+-export
+(
+   [
+      get_char_instances/1,
+      get_char_instance/2,
+      set_char_instance/3
+   ]
+).
+
+-include("timed_cache_data.hrl").
+
+get_char_instances (BattlemapInstance) ->
+   lists:map
+   (
+      fun ({_K, V}) -> V end,
+      dict:to_list(BattlemapInstance#battlemap_instance.chars)
+   ).
+
+get_char_instance (BattlemapInstance, CharInstID) ->
+   {ok, dict:fetch(CharInstID, BattlemapInstance#battlemap_instance.chars)}.
+
+set_char_instance (BattlemapInstance, CharInstID, CharInst) ->
+   BattlemapInstance#battlemap_instance
+   {
+      chars =
+         dict:store
+         (
+            CharInstID,
+            CharInst,
+            BattlemapInstance#battlemap_instance.chars
+         )
+   }.
diff --git a/src/character_instance.erl b/src/character_instance.erl
new file mode 100644
index 0000000..d8d7455
--- /dev/null
+++ b/src/character_instance.erl
@@ -0,0 +1,20 @@
+-module(character_instance).
+-export
+(
+   [
+      set_location/3,
+      get_location/1
+   ]
+).
+
+-include("timed_cache_data.hrl").
+
+set_location (CharInst, X, Y) ->
+   CharInst#character_instance
+   {
+      x = X,
+      y = Y
+   }.
+
+get_location (CharInst) ->
+   {CharInst#character_instance.x, CharInst#character_instance.y}.
diff --git a/src/database_shim.erl b/src/database_shim.erl
index 8b6cea4..0a46c00 100644
--- a/src/database_shim.erl
+++ b/src/database_shim.erl
@@ -3,7 +3,8 @@
 (
    [
       generate_db/1,
-      fetch/2
+      fetch/2,
+      commit/3
    ]
 ).
 
@@ -84,9 +85,13 @@ generate_db (Heir) ->
       BattlemapInstance
    ).
 
-fetch (DB, Object_ID) ->
-   io:format("~ndb_shim lookup: ~p.~n", [{DB, Object_ID}]),
-   case ets:lookup(db_shim, {DB, Object_ID}) of
+fetch (DB, ObjectID) ->
+   io:format("~ndb_shim lookup: ~p.~n", [{DB, ObjectID}]),
+   case ets:lookup(db_shim, {DB, ObjectID}) of
       [{_Key, Value}] -> {ok, Value};
       [] -> nothing
    end.
+
+commit (DB, ObjectID, Value) ->
+   add_to_db({DB, ObjectID}, Value),
+   timed_cache:invalidate(DB, ObjectID).